Around 1801, Thomas Young in England Showed That Light Behaves

Around 1801, Thomas Young in England showed that light behaves as a wave by:

A) deriving a set of mathematical equations that described electromagnetic waves that could have different wavelengths.
B) shining light through two closely spaced slits and observing the resulting pattern of light on a white screen.
C) reflecting light from a rotating mirror and measuring the deflection in different directions.
D) shining light through a glass prism and observing the resulting pattern of colors on a white screen.